Adjustable piston-ring packing.



'1'. CARROLL ADJUSTABLE PISTON RING PACKING. APPLICATION-'HVLEDJPR'. is, 1914.

Patented Ma 25, 1915.

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l IIIIH 7.5 5

f INVENTOR ATTORNEYS."

I 8 mm m mbers.

heads are designed to fit into, a locking ring,

. UNIT D STATES PATENT OFFICE.

1 aosnrn CARROLL, or new YORK, n. Y."

Toajl itmay' concern: I

'Be it known that, I, JO PECARROLL, a subjectof the King of England, and a..resident ofthe city of: New York, .boroilgh of Brooklynyeounty of Kings, and State of New; York,-have invented'a new and Improved Adjustable Piston-Ring Packing, of which the followingis a full, clear, and exact description... v 1111:. 1S: invention relates to improvements in pistons, and piston ring packings,-and has for. an object to provide an improved structure wherein there will be-no pressure of the. expanding ringagainst ;the;cylindm*, and consequently" no appreciable wear thereof- .Anothen object in view is to provide a ring which must be expanded from the in- .terior, and-means for expanding the same which cannot move in a reverse direction so that. the expanded ring will always be maintained in its proper position. v still further object in view is to provide a locking ring-for preventing the adjusting screws n'sedinjexpanding the friction ring from backing off and thereby affecting the' position .of the friction ring. A

I carrying out the object of the invention a piston is provided with a body and a {clamping plate, the body-being grooved or r'ovadedj with an off-set for-accommodataiigj-the friction ring and expanding the V The expanding members are Jbeveled on the exterior for engaging the ;"beveledinterior of the expanding ring, whereby when adjusting screws associated therewith are rotated the expanding ringwill be expanded tothe proper extent. The vadjusting screws are provided with heads formed with a plurality of sides, which Ywhei'eby the screws are prevented from l'backing off, or a reverse rotation.

' the accompanying draw1ngsF1gure' a section through a piston embody; the invention, part of a piston rod being shown in connection therewith; Fig. 12,-: isan edge view of the piston shown in 1'; ,Fig'. 3 is mp-lea xi-V of a piston the'end plate removed and the locking jgn g' b kep ay adjacent one of the adjusting screws; Figzl: is-a sectional view to: l, but disclosing a slightly modifiedforni of the invent on.

Referring tothe accomp fly g dmfllillfi hyfnumeral lfindicates a.

ADJUSTABLE rIsroN-nme PACKING.

Specification of Letters Patent. A

ing ring 8, which ring is provided with an aperture '9 for each of the clamping screws 10. Any desired number of clamping sc rews 10 may be provided, and are formed with many sided heads, as .for instance a six sided head. The apertures 9 are provided with an equal number of sides to the sides of the heads of the screws 10 so as to properly reheive the same. By providing, for instance, a six sided head on screws 10, the

' screws may be adjusted for one sixth of a If there are eight sides on each screws may hey-adjusted to one a revolution, 'and so on, according The various rotation. head the eighth, of to the various requirements.

I Patented May 25,1915. J Ap licationmeaa rn eiem. 'Sen'al No. 832.251. 5 l I r l The piston is 1 against body screws 10 expand through an expandingv ring 11, which is beveled on itsouter face i so as to engage the beveled inner face of the friction ring 12. The ring 11 is preferably formed with a sufficiently large bore as to loosely fit body 3 and thereby permit the friction ring 12 to float' so as to adjust it: self properly to the cylinder.

In operation, when it is desired. to expand the ring 12 from the position shown in Fig.

' 1, nut 2 is removed and also plate 6, together with looking ring 8. Each of the screws 10 arethen turned to the desired extent, each screw beingturned-an equalamount. Locking-ring'S is then placed in position, together with plate 6 andtnut 2. Upon the screwing of nut 2 tightly against plate 6 the plate 6 will force ring 12 against flange 5,

and as ring 12 is moved toward flange 5 the same will engage ring 11 and be expended-thereby, ring 11 having been moved away from flange 5 by the adjusting screws.

In the use of ordinary spring friction rings,- the rings either press outwardly automatically or against the cylinder, and thus produce a greater or less positive friction.

'In the present invention the ring 12 has no tendency to spring outwardly, but rather I a'tendency-to spring or close inwardly. The

expansion means used expands the ring 12 gnd holds the same in an expanded position 'softhatthe ringassociated with the piston does not press whereby when said against the cylinder. This produces the same effect as if it were a solid piston exactly fitting the cylinder.

. In Fig. t will be seen a modified form of, the invention in which the ring is split so that one ring may be divided at point 13 and the other at point it on the opposite side of th piston and thereby obviate the necessity of the werlapping members 15 shown in Fig. '2. In tie form of the invention shown in Fig. the clamping plate 6' is not held in place by hat 2 but is held in place by a plurality of clamping screws 16. Part of the body 3 central bore in plate "6 sothat nut 2 may clamp the piston if properly to body 3.

The clamping plate in this form of the in- \'ent ion is provided with apertures-17 ior acceinn'lodating the heads of the screws 10 that'the clamping plate acts in the double capacity of a clamping plate and a lockr ng for the adjusting screws. It is ot conr e evident that an extra clamping plate similar to clamping plate 6 may be used, if desired, with the. arrangement of plate shown in Fig. 4.

\Yhat I claim, is- 1. A piston COIDPllSlIlg a body, a packin g ring thereior, an expanding ring arranged interiorly of said packing ring, said expand: a

released, .a ringengaging said packing ring for expanding the packing ring, a plurality extends through a of screws engaging said last mentioned ring and said body for moving saidlast mentioned ring in respect to said body so asto cause said packing ring clamping plate formed withapertures for receiving theheads of said screws for locking the screws against rotation. v

3. A piston comprising a b.ody,-a packing ring arranged on said'b'ody, an'e'xpanding ring arranged between said packing ring and said body, the inner face of said packing ringbeingbeveled, and the'outer face of said expanded ring being beveled, a plurality of screws on said body and saidexpanding ring for causing the expanding ring to move relative to said body so that the bevel on the expandingring will cause the packing ring to be expanded each of said screws being formed with apolygonal sided head, a locking ring having polygonal walls for receiving the heads oi said screws .for'preventing the rotation thereof, and a clamping. "plate for holdingin place said locking ring and said packing ring.

l. A piston comprising a'body an expansion ring, a member having formed with apertures a beveled face to expand, and a I the same, a plurality of screws acting on.

said member iorcausing the same to expand said ring, a locking ring provided with an aperture tor receivingthe head of each of said screws, said apertureand heads being whereby said screws'are j prevented from working loose, and means irregular in shape,

for clamping said locking ring in position.

In testlmony whereot'l have signed my name to this specificat on in the presence of CARROLL. 4 

